Tool for treating saw teeth



Oct. 8, 1929.

J. A. sT. CLAIR 1,730,484

'TOOL FOR TREATING SAW TEETH Filed Feb. 5. 1927 INVENTOR To/wv A Si, C1. ngi? Patented Oct. 8, 1929.'

maar

JOHN A. sfr. CLAIR, on INDIANAPOLIS, INDIANA TOOL FOR TREATING- SAW TEETH Application led February 5,192?. Serial No. 166,105.

This invention relates to tools for treating saw teeth, primarily of the cross-cut or drag variety and one feature ofthe invention is in so constructing the tool that a file mayl be secured therein and the tool used as a -handle and the file manipulated for jointing or reducing all the teeth to a uniformlength.

A further feature of the invention is the provision of means for setting parts of the tool whereby the drag teeth or ralers may be shortened to th-e proper length and in such manner that all the drag teeth will be of uniform length and each tooth the same distance below the tops of therespective groups of cutting teeth.

A further feature of the invention is the provision of means for determining to the fractional part ofan inch, the amount of stock to be removed from the various teeth and-the parts of the tool then locked in this position so that all teeth will be shortened to the same degree of length. Y

A further feature of the invention is in so constructing the frame of the. tool that a substantially clear vision of the work being done will be had and the tool is of such na' ture that it may be Vused as successfully in the field or forest aswhen the Work is being` done in a shop. 1

Other obj ects and advantages will be hereinafter more fully set forth and pointed out in the accompanying specification.

In the accompanying drawing which 1s made a part of this application. u

Figure 1 is a side elevation'of the tool with parts arranged 'for j ointing purposes.

Figure 2 is a similar view'showing the parts set for determining the amount of stock to be removed from the points of the'raker teeth. Y Figure 3 is an elevation of the tool with parts set for determining thev degree of swaging to be given the ralIer teeth.

Figure 4 is a 'transverse sectional view through the tool on an Venlarged scale.

Referring to the drawing, 1 indicates the. frame of the tool, whichis preferably oblong and of skeleton formation, the top and bottom edges of the frame1 having pairs of plates 2 and 3 attached thereto, which plates are preferably of hardened material so that the teeth of the saw will not cut into or wear the plates, or the teeth become dulled by en` gagement therewith. The plates 2, as best shown inFig. l of the drawing project lat- `55 erally beyond the face of the frame to pro- 'vide arest for the ends of thecutting teeth 4, as shown in Fig. 2 of the drawing,-as when the raker teeth are being cut down to the proper length, while the plates 3 project v60 in the opposite direction to form a rest for the teeth l during the measurement ofthe swaging operation, as shown inFig. 3 of the drawing.

Substantially atfthe longitudinal center of the frame 1 is a recess 6, in which is mounted a block 7, said block being adjustable in said recess and controlled by means of an adjusting screw 8, one end ofwhich is fixed vto the block and the `opposite end projected through a cross bar 10 on the frame 1. The

Vopposite face of the block 7 has a gauge plate 11 attached thereto, said vplate having flanges 12 atits opposite ends for gui-ding` a yfile,v when the points of the raker teeth are being removed. A'()ne edge of the vplate 11 projects beyond the edge of the block 7 and this projecting portion 13 is provided with a longi- Ytudinal slot 14:,through which the toothV 5 projects whenthe drag or raker end thereof is being led off. vA narrow rib 15'is pref-v Y erably extended along each edge of the slot llto prevent the file striking the face'of the plate 11 during the Vfiling operation and leaving the filed surface more even-by per- .85, mitting a more natural movement of the file.

. The plate andribs are preferably constructed of extremely hard material so that the file will not Aout away any of the face of the plate 11 or ribs 15 thereon. The block 7 is held within the recess 6 and caused to travel i in a straight path in any suitable manner, preferably by means of guide posts 16, one end of the posts beingattached to parts of the frame 1 and their opposite ends entered in bores`17 in thev block 7. r

The top portion of thevblocl 7 is also em- Vployed for locking a file 18 in position en the frame 1, the frame'having a ledge 19. along one facethereof between which and the block, 1,00

. ripheral face of the screw is provided with a graduated scale 23, in this instance each graduation mark representing one one-thousandths of an inch, and supposing ten onethousandths of'an inch-are to be removed from the drag `teeth 5, the thumb screw 2O is rotated in the direction to movecthe block 7 inwardly, Yfrom O until the graduation marked l0 on the periphery of the thumb screw registers with the score line 2d on a part of the frame 1. The lock nut 22 is then operated to lock the thumb screw 2O against further. rotation, thusgholding the parts in fixed adjusted position. rllhe tool is then placed over the saw as indicated in Fig. 2 of thedrawing and a file passed over the protruding portions ofthe raker tooth 5 until the tooth is reduced to a level with the ribs l5 on the plate 11, thus removing exactly ten one-thousandths of an inch from the tooth.

After the tooth 5 has been filed down as described, it is pointed in the usual manner and the pointed ends 'of the tooth swaged to adapt it for-use with the particular class of timber being sawed and in order to swage th-e teeth to exact-ly the same length, a st-ud 25 is threaded through a bracket 26, mounted on the frame l, and on the opposite side thereof from` theblock 7. The outer endof the stud 25 is provided with a knurled head 27, below Ywhich is formed an enlarged circular portion 28 von which is placed graduation marks 29,

" which are likewise. graduated to the thou- 'below the stud 25.

th stud is once set.

sandth of an inch and by turning the stud 25 until the' proper graduation mark on the enlarged portion 28 registers with a score line 30 on thebracket 26, the accuracy of the swaging of the teeth 5 may be instantly determined by inserting the teeth, one at a time, If the raker teeth have been properly swaged, the pointed ends of the tooth will accurately register with the end of the stud, as shown in F 3 of the drawing.

The circular port-'ion 28 of the stud enters a sleeve 3l projecting from the bracket 26, and in said sleeve isplaced va spring 82, or .similar device, which presses against the bottom of the circular portion 28, thus holding the stud 25 against casual rotation, .after It will be understoodl of course, that any other suitable means may be provided for locking theV stud against casual rotation. l l y In operating this form of tool, the file 18 the length to which the raker teeth 5 are to be h cut, has been determined7 this amount being regulated by the hardness or' softness of the timber to be sawed, the thumb nut 20 is rotated to the right (looking at Fig. 2) until the graduation mark determined upon has been turn-ed t-o the score line 24 on the frame 1. As previously stated, supposing ten one-` tliousandth of an inch is tobe removed from i the raker teethl 5, the thumb nut 2O is rotated until the graduation mark 10 thereon registers withthe score line 24, when, by placing the tool over eachzsucceeding raker tooth and :Filing the outer end thereof off even with the tops of the ribs 15, exactly ten one-thousandth of an inch will have been removed from each tooth. v f

rlhe swagingcperation is then performed y on the teeth 5, which may be accomplished in the usual or any preferred manner, and nach point of the raker tooth is swaged to the saine accuracy by setting the stud 25 to determine to the thousandth part of an inch just how muchl each prong of the tooth 5 must be swaged to give a uniform swage to all the raker teeth.

By constructing the frame in substantially skeleton formation, the operator may have a more or less clear vision vof the work being done and as theparts contactingwith the teeth of the saw, also the lile, when being used Y to file down the dragv teeth, are made of eX- ceptionally hard material they will; not become injuredor worn,` and neither will the teeth be chilled byjcoming' in contact therewith.' The frame proper is preferably ccnstructed of some light material, Vsuch as aluminum or the like, thus'very materially reducing the weight of the tool withoutdetracting from its stability and wearing qualities, as all contacting parts areniade of hardened material to guard against wear.Y

It will further lie-seen thatthe device can be manufactured at a minimum cost and when the parts are properly set and applied to use,

the'teeth ofthe saw may be accurately treated and cut down and swaged-to the thousandth part of an inch, each succeeding operation` being the same as the 'preceding one and this work be accomplished by a novice as well -as-one skilled inthe art.

l/Vhat I claim isi l. A tool for regulating the tiling of saw teeth, comprising' av having a recess and cavity therein, Va blockslid'able in said recess, an adjusting screw attached to said block and projecting through said cavity,a thumb nut on the screw and located in said cavity for adjusting said block inwardly or outwardly, said nut'having graduations on its periphery adapted to cooperate with a score line on said frame whereby it may be` accurately and instantly determined when said block has been adjusted to different fractional parts of an inch, and a lock nut also located in said cavity adjacent said thumb nut for locking said thumb nut against casual rotation when properly adjusted.

2. A tool for regulating the ling or cut@ ting down of the raker teeth of a saw comprising a frame, a block slidable in the frame, a screw attached to said block, a thumb nut on said screw having graduations on the periphery thereof adapted to cooperate with a score line on the frame for accurately and instantly determining the adjusted position of said block, a plate attached to said block and projecting beyond one face thereof, said projecting portion having a slot through which the raker tooth is extended when t e end of the tooth is to be filed off, a flange at each end of said plate forming a guide for a file moving thereover, and ribs on the plate impervious to the action of a iile for limiting the filing operation. j

3. A tool'for regulating the filing of saw teeth, comprising a frame having a recess at its longitudinal center and extending inwardly from one edge and one face thereof, an adjustable block having a pair of bores the walls of said cavity and through said cavity, means for lixing said block to one end portion of said adjusting screw, a thumb nut in said cavity, said locking nut being adapt-- ed to `be turned against the opposite wall of said cavity for locking the thumb nut against rotation and be moved into juxtaposition to said thumb nut when said thumb nut is to be operated to adjust the block. i

In testimony whereof I hereto aliix my signature.

JOHN A. STV.v CLAIR.

therethrough, a pair of posts attached to said y frame in said recess and extending through said bores for guiding the block, and means for accurately and instantaneously indicating when said block has been adjusted to thousandths of an inch.

4. A tool for regulating the filing ot saw teeth, comprising a frame having a recess substantially at its longitudinal center, said recess extending inwardly from oneedge'and one face of the frame, said iframe alsohaving .a cavity extending transversely therethrough between the recess and the opposite edge of their-ame, a block slidable in said recess, means attached to the bottomwall of the recess for guiding said block, a threaded adjusting Vscrew projecting through said-cavity and the contiguous walls thereofand threaded into said block, means for locking the block in fixed engagement with said screw,A

a thumb nut threaded onto said'v adjustingl screw and located within said cavity, said thumb nut having graduations thereon, and a locking nut also on said adjusting screw and within said cavity.

5. A tool for regulating the iiling of saw teeth, comprising a frame having a. lateral cavity therethrough, a block slidably mounted on said frame in juxtaposition to said cavity, an adjusting screw passing freely through 

